I didn't know about the 5-minutue editing limit. I added a comment I meant to add to a different page instead, but when I realized it and attempted to blank it out, a blanking is 15 characters too short so I wrote that I was deleting and by then I was past 5 minutes. And, while the limit is not good for some disabled users, I can't say that I have a relevant disability.

Okay, done. The icon is normal for closing, not deleting, and is very faint; and the "edit" link was more intuitive but had disappeared, apparently because I reached the 5-minute editing limit, which is why I asked. Thanks.
– NickJun 6 '18 at 22:33